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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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Serious question here, does "best practice" value smaller lines of code than readability? I think the code in the submission below this one is more readable; therefore, is a best practice. Someone please enlighten me.
a set is a data structure that can contain no duplicate elements.
This is so brilliant! Good work.